1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | 18x 18x 18x 5x 5x 5x 5x | import clickOut from './clickout'; import listenOnRootMixin from './listen-on-root' import { from as arrayFrom } from '../utils/array' // Determine if an HTML element is visible - Faster than CSS check function isVisible(el) { return el && (el.offsetWidth > 0 || el.offsetHeight > 0); } // Return an Array of visible items function filterVisible(els) { return els ? els.filter(el => isVisible(el)) : []; } // Dropdown item CSS selectors const ITEM_SELECTOR = '.dropdown-item:not(.disabled):not([disabled])'; const HEADER_SELECTOR = '.dropdown-header'; const ALL_SELECTOR = [ITEM_SELECTOR, HEADER_SELECTOR].join(','); export default { mixins: [listenOnRootMixin], props: { id: { type: String }, text: { type: String, default: '' }, dropup: { type: Boolean, default: false }, disabled: { type: Boolean, default: false }, right: { type: Boolean, default: false } }, data() { return { visible: false }; }, created() { const listener = el => { if (el !== this) { this.visible = false; } }; // To keep one dropdown opened on page this.listenOnRoot('shown::dropdown', listener); // Hide when clicked on links this.listenOnRoot('clicked::link', listener); }, mounted: clickOut.mounted, destroyed: clickOut.destroyed, watch: { visible(state, old) { if (state === old) { return; // Avoid duplicated emits } if (state) { this.emitOnRoot('shown::dropdown', this); this.$emit('shown'); /* If this is a touch-enabled device we add extra empty mouseover listeners to the body's immediate children; only needed because of broken event delegation on iOS https://www.quirksmode.org/blog/archives/2014/02/mouse_event_bub.html */ if (typeof document !== 'undefined' && 'ontouchstart' in document.documentElement) { const children = arrayFrom(document.body.children); children.forEach(el => { el.addEventListener('mouseover', this.noop); }); } } else { this.emitOnRoot('hidden::dropdown', this); this.$emit('hidden'); /* If this is a touch-enabled device we remove the extra empty mouseover listeners we added for iOS support */ if (typeof document !== 'undefined' && 'ontouchstart' in document.documentElement) { const children = arrayFrom(document.body.children); children.forEach(el => { el.removeEventListener('mouseover', this.noop); }); } } } }, methods: { ...clickOut.methods, noop() { // Do nothing event handler (used in visible watch) }, clickOutListener() { this.visible = false; }, click(e) { if (this.disabled) { this.visible = false; return; } if (this.split) { this.$emit('click', e); this.emitOnRoot('shown::dropdown', this); } else { this.toggle(); } }, toggle() { if (this.disabled) { this.visible = false; return; } this.visible = !this.visible; if (this.visible) { this.$nextTick(function () { // Focus first visible non-disabled item const item = this.getFirstItem(); if (item) { this.focusItem(0, [item]); } }); } }, onTab() { if (this.visible) { this.visible = false; } }, onEsc(e) { if (this.visible) { this.visible = false; e.preventDefault(); e.stopPropagation(); this.$nextTick(function () { // Return focus to original trigger button let el; if (this.split && this.$refs.toggle) { el = this.$refs.toggle.$el || this.$refs.toggle; } else { el = this.$refs.button.$el || this.$refs.button; } if (el && el.focus) { el.focus(); } }); } }, focusNext(e, up) { if (!this.visible) { return; } e.preventDefault(); e.stopPropagation(); this.$nextTick(() => { const items = this.getItems(); if (items.length < 1) { return; } let index = items.indexOf(e.target); if (up && index > 0) { index--; } else if (!up && index < items.length - 1) { index++; } if (index < 0) { index = 0; } this.focusItem(index, items); }); }, focusItem(idx, items) { items.forEach((el, i) => { if (i === idx) { el.focus(); } }); }, getItems() { // Get all items and headers return filterVisible(arrayFrom(this.$refs.menu.querySelectorAll(ALL_SELECTOR))); }, getFirstItem() { // Get the first non-header non-disabled item let item = filterVisible(arrayFrom(this.$refs.menu.querySelectorAll(ITEM_SELECTOR)))[0]; if (!item) { // If no items then try a header item = filterVisible(arrayFrom(this.$refs.menu.querySelectorAll(HEADER_SELECTOR)))[0]; } return item || null; } } }; |